鸿蒙通过Want传递参数

技术都是相互借鉴的，鸿蒙的Want类似于Android的Intent，本文将介绍Ability（Android是Activity，Ios是ViewController）直接的跳转通过Want来传递参数，一个Ability跳转到另外一个Ability，另外一个Ability操作完成后，关闭返回有时候不需要有返回值，有时候需要返回值。本文两种情况都实验了。本文模拟从AbilityTest.ets跳转到NewsAbility.ets。

AbilityTest.ets代码

import { common, Want } from '@kit.AbilityKit'
import { hilog } from '@kit.PerformanceAnalysisKit';
import { TAG } from '@ohos/hypium/src/main/Constant';
import { BusinessError } from '@kit.BasicServicesKit';@Entry
@Component
struct AbilityTest {private context = getContext(this) as common.UIAbilityContext;build() {Column(){Text("Ability跳转测试")Button("跳转到新闻Ability").onClick(()=>{// context为Ability对象的成员，在非Ability对象内部调用需要// 将Context对象传递过去let wantInfo: Want = {deviceId: '', // deviceId为空表示本设备bundleName: 'com.figo.testapplication',//app.json5里面查看moduleName: 'entry', // module.json5里面查看abilityName: 'NewsAbility',//需要跳转过去的abilityName,module.json5里面查看parameters: {//传递的参数// 自定义信息param1: '来自AbilityTest页面的param1',param2: 123},};//1.无需获取返回值startAbility// this.context.startAbility(wantInfo).then(() => {//   let DOMAIN_NUMBER=1000;//   hilog.info(DOMAIN_NUMBER, TAG, 'startAbility success.');// }).catch((error: BusinessError) => {//   let DOMAIN_NUMBER=9999//   hilog.error(DOMAIN_NUMBER, TAG, 'startAbility failed.');// });//2.需要获取下一个ability的返回值startAbilityForResultlet RESULT_CODE=100;//需要和传递的一致let DOMAIN_NUMBER=1000;this.context.startAbilityForResult(wantInfo).then((data) => {if (data?.resultCode === RESULT_CODE) {// 获取被调用ability,本demo是NewsAbility返回的参数let paramNew1 = data.want?.parameters?.paramNew1;let paramNew2 = data.want?.parameters?.paramNew2;hilog.info(0x0000, 'testTag', '接收到NewsAbility返回值为：paramNew1=%{public}s,paramNew2=%{public}d', paramNew1,paramNew2);}hilog.info(DOMAIN_NUMBER, TAG, JSON.stringify(data.resultCode) ?? '');}).catch((err: BusinessError) => {hilog.error(DOMAIN_NUMBER, TAG, `Failed to start ability for result. Code is ${err.code}, message is ${err.message}`);});})}}
}

NewsAbility.ets代码

获取AbilityTest.ets传来的参数

export default class NewsAbility extends UIAbility {onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {// 接收调用方UIAbility传过来的参数let funcAbilityWant = want;let param1 = funcAbilityWant?.parameters?.param1;let param2 = funcAbilityWant?.parameters?.param2;hilog.info(0x0000, 'testTag', '接收到参数param1=%{public}s,param2=%{public}d', param1,param2);}
}

返回值给AbilityTest.ets

import { common } from '@kit.AbilityKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { TAG } from '@ohos/hypium/src/main/Constant';@Entry
@Component
struct NewsPage {build() {Column(){Text("新闻列表页")Button("返回").onClick(()=>{let context: common.UIAbilityContext = getContext(this) as common.UIAbilityContext; // UIAbilityContext// 1.无需返回值的情况 context为需要停止的UIAbility实例的AbilityContext// context.terminateSelf((err) => {//   if (err.code) {//     let DOMAIN_NUMBER = 9999;//     hilog.error(DOMAIN_NUMBER, TAG, `Failed to terminate self. Code is ${err.code}, message is ${err.message}`);//     return;//   }// })//2.需要返回值的情况const RESULT_CODE: number = 100;let abilityResult: common.AbilityResult = {resultCode: RESULT_CODE,want: {bundleName: 'com.figo.testapplication',moduleName: 'entry', // moduleName非必选abilityName: 'EntryAbility',parameters: {paramNew1: '来自AbilityTest页面',paramNew2: 1234567890},},};context.terminateSelfWithResult(abilityResult, (err) => {if (err.code) {let DOMAIN_NUMBER=1000;hilog.error(DOMAIN_NUMBER, TAG, `Failed to terminate self with result. Code is ${err.code}, message is ${err.message}`);return;}});})}}
}